integration of Node-RED with RRDtool?

[Edward Vielmetti]

By way of background, RRDtool is a round-robin database

and simple graphing package that's an interesting approach

for collecting and storing sensor data. It started out as part

of MRTG, a system for collecting stats on network routers, and

has been useful for a number of years.

One of the appealing things about it is that it's compact enough

to run on a Raspberry Pi 2, and that the databases you create

with it are fixed size so they don't grow when you add a record.

​

There's a set of node.js bindings to RRDtool here

https://github.com/Orion98MC/node_rrd

which look like it is in modestly good shape.

I ask partly because there's a Python binding to rrd, and because

the 'mqttwarn' package uses it to provide this interface

https://github.com/jpmens/mqttwarn/wiki/rrdtool

which I'm going to try to rig up to see how it looks.

There is a command line interface to RRDtool that it looks

like it would be easy to adapt in an "exec" node, but that's 

very much a second choice if someone has done the native

interface.

--

Edward Vielmetti +1 734 330 2465

edward.v...@gmail.com

[Dave C-J]

Hi Edward,
Must admit I did look at that a while back and as it was labeled alpha but 2012, and requires compiling with gyp on install I just went with using exec for my home server :-)

I set up the database manually, then used one exec node to insert values, and another to generate graphs for a web page.

[Geoffrey Arnold]

Hey Edward,

I couldn't find a direct Node-RED -> RRDtool plugin on npmjs.com, however you can configure Collectd[1] to write metrics to RRDtool, and use the native Node-RED Collectd plugin to send metrics to Collectd[2], ie. Node-RED -> Collectd -> RRDtool.

That said, we disable RRDtool on our Pis[3] as the high IO doesn't play nicely with SD cards, and instead use an external service called Librato[4][5] to aggregate metrics.

Best,

Geoff.

[1] https://collectd.org/documentation/manpages/collectd.conf.5.shtml#plugin_rrdtool

[2] https://www.npmjs.com/package/node-red-contrib-collectd

[3] https://github.com/hubofthings/raspberry-pi-recipes/blob/master/scripts/configure-collectd#L11

[4] https://www.librato.com/

[5] https://www.npmjs.com/package/node-red-contrib-librato

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[Dave C-J]

Nice !
Good point re SD cards on Pi (or anywhere else). I'm not using SD on my home server so not a problem for me, but yes. Though must say I've not had many SD failure from writes at the rates I'm outputting data on other systems. (Few writes per minute).